Roll wrapping



A. w. LANCASTER 2,893,190

July 7, 1959 ROLL WRAPPING Filed July 6, 1955 3 Sheets-Sheet 1 i HUM 1 M WWW FROM ROLL l4;

n u END BAND 50 ms I Inventor ARTHUR WESLEYLANCASTER July 7, 1959 A.YW. IJANICASTER 2,893,190

ROLL. WRA'PPING Filed July 6, 1955 3 Sheets-Sheet 2 Inventor ARTHUR WESLEY LANCASTER By; W

Att'ys July 7, 1959 A. w. LANCASTER ROLL WRAPPING 3 Sheets-Sheet 5 Filed July 6, 1955 Inventor ARTHUR WESLEY LANCASTER BY 4 I 9 Attys Umted States Patent O we patented My? 195.9

by mesne assignments, to Williams & Wilson Limited, Montreal, Quebec, Canada Application July 6, 1955, Serial No. 520,315

Claims. (Cl. 53- 380) This invention relates to a roll wrapping machine and improvements therein. By a roll I mean any cylindrical object to be wrapped in paper, but the invention is particularly applicable to rolls of paper to be so Wrapped.

The wrapping machine and improvements are shown in the attached drawings in which:

Figure 1 shows a schematic illustration of the operation of a paper wrapping machine.

Figure 2 illustrates the strip used with the invention.

Figure 3 illustrates the crimping mechanism.

The overall operation of the machine may be indicated by a reference to Figure 1.

A cabinet schematically shown at supports a series of rollers 12, 14A, 14B carrying wrapping paper adapted to supply the wrapping paper strip 16 to wrap a roll 18 as shown at the bottom of the machine resting on and rotated by a pair of drive rollers 20 and 22.

The wrapping paper strip is hereinafter referred to as the Wrapping strip 16 or as the strip 16 to distinguish it from the roll Oif paper or other material 18 to be wrapped. For the purposes of this application it is suflicient if the paper 18 is considered as a cylindrical body to be wrapped.

The paper supplied (say) by roll 12 is led under a tension roller 26 about a driven roller 28 and between a pair of horizontally disposed puller rollers 30 and 32. The horizontally disposed puller rollers provide a vertical path for the strip into guide means 34 where the cutting and gluing is performed as Will be described hereinafter, by means shown here schematically as 36.

After the necessary glue is applied and the paper is cut as will be hereinafter described, the paper length is supplied between press roll 38 and the roll 18 under the assistance of any suitable guide means such as those schematically shown at 40.

The roll to be wrapped is rotated under the impulsion of drive rollers 20 and 22.

The leading end of a length of a glued strip 16 is caught between the press roll 38 and the roll to be wrapped 18 and the press roll pressure attaches the strip end to roll 18 where it is pulled around with that roll. When the length of the strip 16 from the end initially stuck to roll 18 to the cutting means is suificient to supply the requisite number of wrapping turns, the wrapping movement of strip 16 is halted by stopping puller rollers 30 and 32 and drive rollers 2t) and 22, and the cutting and gluing means 36 cuts off the wrapping length. The movement of the drive rolls is then recommenced until the cut end of the first length of strip 16 is wound on the roll 18.

Glue for attaching the beginning and end of the length is applied by suitable means adjacent the cutting and gluing means 36.

The wrapping paper strip 16 must be not only wide enough to provide a portion 43 to cover the roll 18 to be wrapped but must also be wide enough to supply an extension 44 and 46 on each side for crimping over each end thereof.

Crimping means 146 (see Figure 8) to crimp the over-extending portions 44 and 46 of the strip 16 on to the ends of the rolls 18, are provided as illustrated at each end of the roll 22. The crirnped portions known as crimps are designated as 49 on Figure 2.

Due to the tendency to fray that transportation and handling produce at the corners of the rolls reinforcing strips known as end bands 48 and 50 are attached to each side of the strip 16 for reinforcement purposes.

When the wrapping strip is applied to the roll to be wrapped, crimping means are provided at each end thereof to produce an adequate crimping. It had been known to provide crimpers which rotated on one of the drive rollers which contacted the over-extending paper at each end of the roll to be wrapped and crimped it down against the roll 18. It was also known that due to the increasing thickness of the paper at the end of the roll as it was crimped the crimping rollers must retract slightly axially and resilient means were provided for such retraction. However, since the crimping action is not only an axial one but has a circumferential component, the resistance to such crimping as the paper became thicker was a helical one.

Unless the retractability of the crimper rollers corresponds in direction and sense to the reactive force exerted by the paper, torn paper and improper crimps can result (see US. Patent No. 2,63 8,725 to A. T. Hurter et al.).

Thus proper crimping cannot be achieved unless the crimping blocks can retract in the direction of the reactive force exerted by the thickening paper, hence the crimping blocks must be helically retractable.

It is therefore an object of the present invention to provide a method and means. whereby the crimpers are allowed a certain resilient helical retraction during crimping.

It is an object of the present invention also to provide crimpers which move into and out of position under hydraulic or pneumatic pressure.

It is a specific object of this invention to provide crimping blocks which bend the paper relative to the roll, the blocks being shaped as truncated sectors of a circle, said blocks being arranged on a crimper mounting member and being arranged coaxially with one of the drive rollers.

The crimper blocks are preferably chamfered on their leading radial edges to ease the bending operation.

Referring now to Figures 2 and 3, one of the drive rollers 22 is shown provided with longitudinal slots adapted to receive an axially slidable bar 122. The bar 122 is attached to a slotted shaft 124 contiguously projecting from the outer portion of a thrust bearing 126. The inner portion of the thrust bearing is connected to an axial thrust shaft 128 operated by an air piston 130 for application of the crimpers to and retraction from the roll. The keying diametrical bar 122 is rigidly attached to a sleeve 131 slidable axially on the roller 22 provided with a radially extending flange 134. The sleeve 131 is provided with four upwardly extending guide rollers 132 and on the outer surface of the sleeve 131 is mounted a sliding member 138 which has a lange radially extending flange 135 on the end adjacent the roll carrying the crimping blocks 146. An annular backing ring 136 is slidably movable on the sleeve 131 and its backward movement is restrained by the radial flange 134 and is resiliently connected to the crimper mounting member 138 by compression springs 140. Circumferential alignment between the backing ring 136 and the block mounting member 138 is maintained by keying rods 142 which are adapted to be received in elongated apertures (not shown) in the crimper mounting member 138. Thus the crimper mounting member 138 may move axially with respect to the mounting ring, but relative circumferential movement between these two members is prevented by the keying rods 142. A number of helical slots 144 in the crimper block mounting member 138 extending helically away fromthe roll to be wrapped in the opposite direction to that of rotation and receive the rollers 132, the slots and rollers thereby defining the relative movement between the mounting member 138 and the sleeve 131 and therefore between the crimper blocks 146 and the drive roll 22. Thus on the receipt of reaction pressure by blocks 146 from the paper being crimped the mounting, member 138 moves helically backward under the resisting pressure until the resilient compression springs 1 40 balance the pressure of the paper being crimped. Meanwhile the springs are retained axially aligned by the keying rods 142 and the radial movement of the ring 136.

The crimper blocks 146 are preferably truncated sectors of a circle and such sectors are mounted on each mounting member 138 facing the roll 18 to be wrapped, the sectors delineating a portion of the outline of a circle co-axial with the axis of rotation of mounting member 138 and roller 22. The leading radial edge 148 of each block is chamferred as shown, to ease the initial reactive crimping pressure between paper and crimper.

During the placing of a roll to be wrapped on the drive rollers and during the removal of a wrapped roll therefrom, the crimpers must be retracted from the vicinity of the wrapped roll and then must be brought into contact with the roll during the crimping operation.

When this operation is performed mechanically some difficulty is encounted in bringing the crimper blocks into the proper degree of contact with the roll ends.

It has therefore been found advantageous to provide a hydraulic or pneumatic control for the crimpers on each side of the roll whereby the crimpers may easily be applied to and retracted from the roll to be wrapped. No

problem is encountered in bringing the blocks into contact with the roll because the blocks and their mounting members merely move inward under hydraulic or pneumatic pressure until contact is made with the roll which acts as the stop member [for the movement of the crimper assembly.

There is thus provided a set of crimper blocks 146 v which may be moved into and out of contact with the roll to be crimped and supply a crimping action thereto by piston-operated means and wherein the reaction by the thickening paper has been compensated for by the helical retraction means.

I claim:

1. In a roll wrapping machine: a pair of drive rollers for rotating and supporting said roll during wrapping; a

' pair of crimping means slidably mounted on one of the drive rollers, retractable means for moving said crimping means into contact with said rolls to perform the crimping operation, and means allowing helical retraction of said crimper blocks relative to said wrapped roll.

2,. Crimping means comprising: a pair of drive rollers adapted to mount a roll to be wrapped, a pair of sleeves axially movable with respect to one drive roller, crimper block mounting means helically movable with respect to said sleeves and resilient means biasing said block mounting means toward said roll relative to said sleeves.

3. In a roll wrapping machine having means for supporting and rotating a roll to be wrapped; a pair of crimping means adapted to rotate adjacent each end of the roll to be wrapped tfor crimping the wrapping paper thereabout, said crimper means comprising a number of truncated sectorial blocks together delineating a circle adapted to rotate parallel to and adjacent the end of said roll.

4. In a roll wrapping machine having means for supporting and rotating a roll to be wrapped: a pair of crimping means adapted to rotate adjacent each end of said roll about an axis parallel thereto for crimping the wrapping paper thereabout, said crimper means comprising a number of circumferentially spaced blocks provided with radial leading edges adapted to contact said wrapping paper.

5. A roll wrapping machine as claimed in claim 4 wherein said leading edges are chamfered.

References Cited in the file of this patent UNITED STATES PATENTS 1,351,809 Sutherland Sept. 7, 1920 2,533,993 Bryans Dec. 20, 1950 2,638,725 Hurter et a1. May 19, 1953 2,803,935 Gibson Aug. 27, 1957 

